Guixuan Wu

A Structure-Based Viscosity Model and Database for Multicomponent Oxide Melts

Based on the thermodynamic associate species model, a new viscosity model and database are currently being developed for the fully liquid system SiO2-Al2O3-CaO-MgO-Na2O-K2O-FeO-Fe2O3-P2O5and its subsystems in the Newtonian range. The modified Arrhenius model, employed in this database, is a structure-based viscosity model, in which the associate species link the viscosity to the internal structure of melts. Both the temperature- and composition-induced structural changes of melts are then described by a set of monomeric associate species in combination with the critical clusters induced by self- and inter-polymerization. The viscosity, therefore, is well described over the whole range of compositions and a broad range of temperatures by using only one set of model parameters, which have clear physico-chemical meaning. Moreover, the model is self-consistent, meaning the extension of viscosities from lower order systems to higher order systems is valid, and vice versa.